/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using Lucene.Net.Documents;
using IndexOutput = Lucene.Net.Store.IndexOutput;

namespace Lucene.Net.Index
{
    
    sealed class StoredFieldsWriterPerThread
    {
        
        internal FieldsWriter localFieldsWriter;
        internal StoredFieldsWriter storedFieldsWriter;
        internal DocumentsWriter.DocState docState;
        
        internal StoredFieldsWriter.PerDoc doc;
        
        public StoredFieldsWriterPerThread(DocumentsWriter.DocState docState, StoredFieldsWriter storedFieldsWriter)
        {
            this.storedFieldsWriter = storedFieldsWriter;
            this.docState = docState;
            localFieldsWriter = new FieldsWriter((IndexOutput) null, (IndexOutput) null, storedFieldsWriter.fieldInfos);
        }
        
        public void  StartDocument()
        {
            if (doc != null)
            {
                // Only happens if previous document hit non-aborting
                // exception while writing stored fields into
                // localFieldsWriter:
                doc.Reset();
                doc.docID = docState.docID;
            }
        }
        
        public void  AddField(IFieldable field, FieldInfo fieldInfo)
        {
            if (doc == null)
            {
                doc = storedFieldsWriter.GetPerDoc();
                doc.docID = docState.docID;
                localFieldsWriter.SetFieldsStream(doc.fdt);
                System.Diagnostics.Debug.Assert(doc.numStoredFields == 0, "doc.numStoredFields=" + doc.numStoredFields);
                System.Diagnostics.Debug.Assert(0 == doc.fdt.Length);
                System.Diagnostics.Debug.Assert(0 == doc.fdt.FilePointer);
            }
            
            localFieldsWriter.WriteField(fieldInfo, field);
            System.Diagnostics.Debug.Assert(docState.TestPoint("StoredFieldsWriterPerThread.processFields.writeField"));
            doc.numStoredFields++;
        }
        
        public DocumentsWriter.DocWriter FinishDocument()
        {
            // If there were any stored fields in this doc, doc will
            // be non-null; else it's null.
            try
            {
                return doc;
            }
            finally
            {
                doc = null;
            }
        }
        
        public void  Abort()
        {
            if (doc != null)
            {
                doc.Abort();
                doc = null;
            }
        }
    }
}